chore: add PR labeler

[hntrl]

adapted from https://github.com/langchain-ai/docs/blob/main/.github/workflows/labeler.yml

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Latest commit: 25eb762

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Project	Deployment	Preview	Comments	Updated (UTC)
langchainjs-docs	Ready	Preview	Comment	Sep 29, 2025 7:36pm

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Project	Deployment	Preview	Comments	Updated (UTC)
langchainjs-api-refs	Ignored			Sep 29, 2025 7:36pm